SRM University 2007 B.Tech Electronics and Communications Engineering Bank of Computer Communication Networks - Question Paper

SRM Institute of Science & Technology
School of Electronics & Communication Engineering
ques. Bank
Subject Code : EC304
Subject Name : Computer Communication Networks
Year & Semester : III Year VI Sem. (ECE)
UNIT-I
PART- A
1. What is FDM?
2. What is modem?
3. Define Local loop.
4. Define Asynchronous communication.
5. Define Synchronous communication.
6. What is Front-End- Processor.
7. What is a multiplexer?
8. List any 2 kinds of data transfer modes.
9. Give 2 goals of a network.
10. Differentiate half-duplex & full duplex mode of data transfer.
11. What is need for packet switching?
12. Define datagram.
13. Give 2 functions of message switching.
14. Distinguish ranging from multiplexers and concentrators.
15. What is hub polling?
16. What are the advantages of TDM?
17. Distinguish ranging from synchronous and Asynchronous TDM?
18. Define Computer Networks
19. Give 2 advantages of serial I/O over parallel I/O.
20. What is IMP?
PART-B
1. Explain synchronous communication.
2. Explain asynchronous communication.
3. Explain FDM telephone systems.
4. With a neat block diagram discuss FDM transmitter and Receiver.
5. Explain synchronous TDM and asynchronous TDM.
6. Explain circuit switching with a neat diagram.
7. What is packet switching? discuss with timing diagram.
8. What is message switching, discuss. Compare message switching with circuit switching.
9. Distinguish ranging from packet switching and circuit switching?
10. Compare virtual circuit switching and Datagram technique.
11. Compare FDM with TDM.
UNIT – II
Part – A
1. List the layers of OSI model?
2. List the various network topologies.
3. Explain the function of data link layer.
4. Which layer of OSI provides synchronization?
5. Which layer of OSI provides routing functions?
6. Give any 2 physical layer interface standards?
7. What is X.21?
8. What is parity check?
9. What is CRC?
10. What are the various ARQ Schemes?
11. What is ARQ?
12. What is the advantage of selective repeat ARQ over GO-back-N ARQ?
13. What is piggybacking?
14. What is bit stuffing?
15. Give the frame format for HDLC?
16. Why flow control is needed?
17. What is flow control mechanism?
18. What are the protocols for flow control in the data link layer?
19. What is RS232?
Part – B
1. Draw OSI reference model? discuss in detail the functions of every layer.
2. Explain EIA 232 physical layer standard interface in detail
3. Explain Stop-N-Wait flow control and sliding window flow control protocols.
4. Given message M=1010001101 and trend p=110101. calculate FCS, discuss how fault detection in carried out in CRC.
5. Explain Go-back-N ARQ and selective Repeat ARQ with timing diagrams.
6. Explain High level Data Link (HDLC) protocol.


UNIT – III
PART – A

Earning:   Approval pending.